31375467728 has 20 divisors (see below), whose sum is σ = 66316329888. Its totient is φ = 14261576160.

The previous prime is 31375467727. The next prime is 31375467731. The reversal of 31375467728 is 82776457313.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31375467728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31375467727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89134676 + ... + 89135027.

Almost surely, 2^31375467728 is an apocalyptic number.

It is an amenable number.

31375467728 is an abundant number, since it is smaller than the sum of its proper divisors (34940862160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31375467728 is a wasteful number, since it uses less digits than its factorization.

31375467728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178269722 (or 178269716 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 53.

The spelling of 31375467728 in words is "thirty-one billion, three hundred seventy-five million, four hundred sixty-seven thousand, seven hundred twenty-eight".